According the change log, in the viewer you can now disable the showing of the help message when entering full screen mode. A feature I admire as I know that drill by now
Unfortunately, the help message disablement also disables the usage of the esc key. I do not know whether this is intentionally, but to my humble opinion it is not an expected behavior.
Under both circumstances the F11 key still helps, so there is always a way out from the full screen mode.